If the man spent 30 mountain biking, how many minutes did he spending line skatinf

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

The table respent two linear functions the equation respented by the first tables is given

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.